Is there a <NotIn> LINQ method?

Is there a NotIn LINQ method ?

// A: 1,2,3,4,5
// B: 4,5,6,7,8
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C = A.NotIn(B);

// C: 1,2,3

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IEnumerable<T>.Except

var a = new int[] {1, 2, 3, 4, 5};
var b = new int[] {4, 5, 6, 7, 8};
var c = a.Except(b);
foreach(var x in c)
    Console.WriteLine(x);

output:

1
2
3

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Yes it is. It's called Except.

So in your case, C = A.Except(B);

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That will be Except (assuming A and B are enumerable):

var C = A.Except(B);